Originally Posted by dantheman2go
Hi, I was hoping you could give me advice on a problem that is absolutely driving me crazy with an AVATRIX system I installed a couple of days ago. This is my first time installing this system and I'll try to be as detailed as possible.
I installed an AVM-562 with 2 expansion units (1176) for a restaurant. The restaurant hired an electrician to run 2 pairs of cat6 belden media twist to 18 different locations where we hung 18 LCD TVs. I terminated and tested all cables to make sure there would be no problems. The 6 sources connected are 4 DirecTV H21s and 2 Time Warner HD set top boxes manufactured by Samsung. I wired everything up and tested it out and at first all 18 TVs appeared to work properly. However after about an hour of operation I noticed 3 of the 18 TVs developed a problem. No matter which source was directed to the 3 TVs, the picture would intermittently black out. It is a quick flash. I'd say half a second, The picture will be fine for say another 30 seconds and then it would black out again, then come on for another 5 seconds and repeat the cycle. It occurs at completely random frequencies. Here is a list of things I did to troubleshoot:
Swapped the balun for a known good balun.
Swapped the component video cables at the tv set.
Plugged the tv into an outlet of an unaffected tv.
Swapped the output on the back of the AVM-562 to a known good output.
Swapped cat6 cable A with cat6 cable B (not cross output A into B).
Cable length is less than 100'. Adjusted dial on balun from 0 to 1 just in case. Set back to 0.
None of the above solved the problem.
One of the unaffected TVs was in range of an affected one, so I unplugged the component video cables from the back of the good set and plugged them into the suspect set. The picture still flashed at random.
After all this testing I would believe the TV is defective but then what are the chances of 3 becoming defective at once? Prior to installing this system, these TVs were connected via co-ax cable and worked fine.
All TVs are 37" Toshibas. However this job was done over a period of time. The first half of the TVs we delivered and installed were 37av502u. The second half installed were 37av502r. Then we installed the matrix. The 3 problem TVs are 37av502r.
I've been searching the web for days for anyone with a similar problem and have been unsuccessful.
I didn't check to see if the cable lines and satellite lines are properly grounded. Could that be a cause of the problem?
I did notice if I changed the output resolution of the DirecTV receiver and set top box to 480i, the TVs didn't flash. On 720p and 1080i they did flash.
I also noticed that on 4/29/09 Toshiba came out with a firmware update for the 37av502r but it's only described to "fix audio muting issues with certain channels from certain cable providers".
I'll be heading back to the restaurant in a few days and was hoping it is something I might be able to fix before having the TVs serviced by Toshiba.
Any suggestions are greatly appreciated!